Fastener



FIG. 1 is a perspective view of a first embodiment of a fastener showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a reduced environmental view thereof;

FIG. 9 is a perspective view of a second embodiment showing our new design;

FIG. 10 is a front elevation view thereof;

FIG. 11 is a rear elevation view thereof;

FIG. 12 is a left side elevation view thereof;

FIG. 13 is a right side elevation view thereof;

FIG. 14 is a top view thereof;

FIG. 15 is a bottom view thereof; and,

FIG. 16 is a reduced environmental view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a fastener, as shown and described. 